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Design of integrated on-chip impedan...

Colorado State University.

Design of integrated on-chip impedance sensors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design of integrated on-chip impedance sensors.
Author:	Kern, Tucker.
Description:	105 p.
Notes:	Source: Masters Abstracts International, Volume: 53-05.
Notes:	Adviser: Thomas W. Chen.
Contained By:	Masters Abstracts International53-05(E).
Subject:	Electrical engineering.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1564470
ISBN:	9781321168013

Design of integrated on-chip impedance sensors.
Kern, Tucker.

Design of integrated on-chip impedance sensors. - 105 p.

Source: Masters Abstracts International, Volume: 53-05.

Thesis (M.S.)--Colorado State University, 2014.

This item must not be sold to any third party vendors.

In this thesis two integrated sensor systems for measuring the impedance of a device under test (DUT) are presented. Both sensors have potential applications in label-free affinity biosensors for biological and bio-medical analysis. The first sensor is a purely capacitive sensor that operates on the theory of capacitive division. Test capacitance is placed within a capacitive divider and produces an output voltage proportional to its value. This voltage is then converted to a time-domain signal for easy readout. The prototype capacitive sensor shows a resolution of 5 fF on a base of 500 fF, which corresponds to a 1 % resolution. The second sensor, a general purpose impedance sensor calculates the ratio between a DUT and reference impedance when stimulated by a sinusoidal signal. Computation of DUT magnitude and phase is accomplished in silicon via mixed-signal division and a phase module. An automatic gain controller (AGC) allows the sensor to measure impedance from 30 &OHgr; to 2.5 M&OHgr; with no more than 10 % error and a resolution of at least .44 %.

ISBN: 9781321168013Subjects--Topical Terms:

454503
Electrical engineering.

Design of integrated on-chip impedance sensors.
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100 1 $a Kern, Tucker. $3 708581
245 1 0 $a Design of integrated on-chip impedance sensors.
300 $a 105 p.
500 $a Source: Masters Abstracts International, Volume: 53-05.
500 $a Adviser: Thomas W. Chen.
502 $a Thesis (M.S.)--Colorado State University, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a In this thesis two integrated sensor systems for measuring the impedance of a device under test (DUT) are presented. Both sensors have potential applications in label-free affinity biosensors for biological and bio-medical analysis. The first sensor is a purely capacitive sensor that operates on the theory of capacitive division. Test capacitance is placed within a capacitive divider and produces an output voltage proportional to its value. This voltage is then converted to a time-domain signal for easy readout. The prototype capacitive sensor shows a resolution of 5 fF on a base of 500 fF, which corresponds to a 1 % resolution. The second sensor, a general purpose impedance sensor calculates the ratio between a DUT and reference impedance when stimulated by a sinusoidal signal. Computation of DUT magnitude and phase is accomplished in silicon via mixed-signal division and a phase module. An automatic gain controller (AGC) allows the sensor to measure impedance from 30 &OHgr; to 2.5 M&OHgr; with no more than 10 % error and a resolution of at least .44 %.
520 $a Prototypes of both sensing topologies were implemented in a .18 microm CMOS process and their operation in silicon was verified. The prototype capacitive sensor required a circuit area of .014 mm2 and successfully demonstrated a resolution of 5 fF in silicon. A prototype impedance sensor without the phase module or AGC was implemented with a circuit area of .17 mm2. Functional verification of the peak capture systems and mixed-signal divider was accomplished. The complete implementation of the impedance sensor, with phase module and AGC, requires an estimated .28 mm 2 of circuit area.
590 $a School code: 0053.
650 4 $a Electrical engineering. $3 454503
690 $a 0544
710 2 $a Colorado State University. $b Electrical and Computer Engineering. $3 708582
773 0 $t Masters Abstracts International $g 53-05(E).
790 $a 0053
791 $a M.S.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1564470